JPS595095B2 - Method for manufacturing breathable packaging material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing packaging materials used for manufacturing bags for packaging desiccants, deodorizers, insect repellents, oxygen scavengers, etc. A polyolefin is laminated to a base material made of a material that blocks the passage of fine powder having The present invention relates to a method of manufacturing a breathable packaging material having perforations in the layer.

A first object of the present invention is to provide a manufacturing method that allows the above-mentioned breathable packaging material to be produced relatively easily using simple equipment without requiring large-scale equipment.

A second object of the present invention is to provide a manufacturing method that makes it possible to obtain a breathable packaging material that is strong and difficult for young children to tear. 20 That is, the first invention provides a polyolefin film layer on the surface of a base material made of a material that has air permeability but blocks the passage of fine powder to form a laminate consisting of the base material and the polyolefin film, and The body is passed between a support roll and a needle provided with the pointed end facing the support roll, with the base material side facing the support roll, and then the needle passes through the center of the needle to remove only the polyolefin film. Then, the laminate is moved while being supported by the support roll, and the polyolefin pool 3 is drilled by the needle.
0 A method for producing a tear-resistant breathable packaging material, characterized in that the polyolefin film layer is scratched to form a scratch hole passing through the polyolefin film layer. A polyolefin film layer and a mesh-like reinforcing material are sequentially laminated on the surface of a base material made of a material that has properties but blocks the passage of fine powder, thereby forming a laminate consisting of the base material, a polyolefin film, and a mesh-like reinforcing material. The laminate is passed between a support roll and a needle whose tip is directed toward the support roll, with the base surface facing the support roll, and then the pressure of the needle is applied. The needle is adjusted so that it perforates only the polyolefin film, and then the laminate is run while being supported by the support roll, and the needle scratches the polyolefin film layer to apply it to the polyolefin film layer. This is a method for manufacturing a tear-resistant breathable packaging material, which is characterized by forming penetrating scratch holes.

Hereinafter, the present invention will be explained in detail with reference to the drawings. First, as shown in the first diagram, polyethylene, polypropylene, ethylene, etc. are coated on the surface of a web-like base material 1 made of a material such as paper or nonwoven fabric that has air permeability, blocks the passage of fine powder, and has a stiffness suitable as a packaging material. A polyolefin film layer 2 is formed by extrusion coating a polyolefin resin such as a vinyl monoacetate copolymer to form a laminate 3 comprising the base material 1 and the polyolefin film layer 2.

Next, as shown in FIG.
The laminated body 3 is placed between a plurality of needles 1 arranged in parallel at predetermined intervals with the pointed ends of the heads fixed by screws 6 facing the support roll 4 and aligned at predetermined intervals. One side of the base material is passed through the support roll 4 in opposition to it. In addition to the above, pillar 5
As shown in the enlarged view in FIG. 3, holes 8 are opened on both sides of the holder, and an upright support rod 9 is inserted into the hole 8.
A pair of coil springs 10, 10 are connected to a support rod 9 with the support 5 in between.
Nuts 11 are attached to the upper end of the upper coil spring 10 and the lower end of the lower coil spring 10, respectively. By moving the nuts 11 up and down, the support 5 can be leveled and the needle can be aligned. It is constructed so that the pressure can be adjusted. Move the nut 11 up and down to apply pressure to the needle 7. 3Polyolefin film 2
After making adjustments so as to perforate only the polyolefin film layer 2, the laminate 3 is moved in the direction of the arrow while being supported by the support roll 4, and the polyolefin film layer 2 is scratched with the needle 7, as shown in the fourth figure. A base material 1 made of a material that has air permeability but blocks the passage of fine powder as shown in Figure 5 by providing scratch holes 12 therethrough.
and a polyolefin film layer 2 with scratch holes 12 formed therein.
A breathable packaging material 1-3 is obtained.

In this case, the base material 1 acts to give the breathable packaging material itself a stiffness suitable for packaging, and the polyolefin film layer 2
shields a part of the base material 1, has the function of adjusting the moisture permeability of the base material 1, and has the function of imparting heat sealability to the packaging material itself.

The air-permeable packaging material 13 can be used to manufacture bags for packaging desiccant agents, deodorizers, insect repellents, oxygen scavengers, and the like. In the above manufacturing method, it is desirable to use a needle 7 with a sharp tip.

This is because if the tip of the needle is blunt, it is difficult to form scratch holes in the polyolefin film layer (dregs tend to accumulate). still,
If the tip of the needle is sharp, scratch holes are likely to be formed, but if the pressure is too strong, the base material is likely to be scratched, so the pressure must be adjusted sufficiently. It is desirable that the needles 7 be provided vertically as shown in Figure 6, and positioned at the C portion of the support roll 4, since this makes it difficult to make holes in the base material.

The needle has an angle α of 60 with respect to the peripheral surface of the support roll 4.
It is preferable to select and provide the position at an angle of ~80 degrees.
On the other hand, it is not desirable to use the A section because the holes will extend all the way to the base material, and it is not desirable to use the B section because the holes will easily extend to the paper.

The above is an explanation of the first invention.

Next, the second invention will be explained.

First, as shown in Fig. Nisseki Warif (Japan (manufactured by Sekiyu Co., Ltd.) etc., extrusion laminate a polyolefin resin such as polyethylene, polypropylene, or ethylene monovinyl acetate copolymer between the layers, and bond them together to form a mesh with the base material 1 and the polyolefin film layer 2. A laminate 15 made of the reinforcing material 14 is formed.

Thereafter, scratch holes 12 are drilled in the same manner as the scratch hole drilling operation in the manufacturing method according to the first invention, and a material having air permeability but blocking the passage of fine powder as shown in FIG. 8 is prepared. A breathable packaging material 16 which is strong in strength and breathable and is resistant to tearing is obtained, which is made of a base material 1 consisting of a base material 1, a polyolefin film layer 2 having scratch holes 12, and a mesh-like reinforcing material 14. Since this breathable packaging material 16 is reinforced with a mesh-like reinforcing material, it is stronger than the breathable packaging material 13 obtained by the manufacturing method according to the first invention and cannot be torn by a child's hand.

According to the above-mentioned breathable packaging material 16, it is possible to make a strong bag that prevents an infant from tearing the bag and taking out the contents. Accidents can be completely prevented from occurring.

Regarding the above manufacturing method, the working conditions when scratching the polyolefin film with the needle 7 are as described in the description of the manufacturing method according to the first invention. Note that even when scratched with the needle 7, no scratch hole is formed in the mesh-like reinforcing material 14 because of its strong strength, and the scratch hole is formed only in the polyolefin film layer 2. Next, the present invention will be specifically explained with reference to Examples. Example 1 A web-shaped bleached kraft (30 t/d) was extruded and coated with polyethylene to provide a 15 μm thick polyethylene film layer to form a web-shaped laminate consisting of the bleached kraft and the polyethylene film layer.

On the other hand, as shown in the second figure, +14 sewing machine needles were attached to the support in parallel with their tips aligned at 1 cm intervals.

After passing the above laminate between a support roll and a sewing needle, the coil springs on both sides of the support are adjusted to adjust the pressure of the needle so that only the polyethylene film is perforated, and then the laminate is supported. The polyethylene film was scratched with a sewing needle while being supported by a roll in the direction of the arrow, and a scratch hole was formed through the polyethylene film layer to form a breathable packaging material with a moisture permeability of 500 t/d/day. Obtained. Example 2 A mesh-like reinforcing agent (a mesh-like nonwoven fabric made of split fibers of stretched high-density polyethylene film, Nisseki Warif (manufactured by Nippon Oil Co., Ltd.) was extruded onto a web-like bleached kraft 50f/d, and a sheet of polyethylene 15μ laminated with it was used. A web-like laminate consisting of the bleached kraft, the polyethylene film layer, and the mesh-like reinforcing material was formed.

On the other hand, as shown in the second figure, two +14 sewing machine needles were attached to the support in parallel with their points aligned at intervals of 2 m.

Thereafter, scratch holes were drilled in the same manner as in the first embodiment to obtain moisture permeability 2.
A breathable packaging material of 50 f/d/day was obtained. As described in detail above, according to the present invention, not only can a breathable packaging material with suitable moisture permeability be obtained relatively easily using simple equipment without requiring large-scale equipment, but it can also be easily used by children's hands. It is also possible to obtain a strong, breathable packaging material that cannot be torn.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a laminate consisting of a base material and a polyolefin film layer, Figure 2 is a perspective view of the laminate passed between a support roll and needles, and Figure 3 is a coil spring and nut attached. Fig. 4 is a perspective view of the scratch hole being drilled, Fig. 5 is a sectional view of the obtained product, and Fig. 6 shows the proper position of the needle. Explanatory diagram, 7th
The figure is a sectional view of a laminate consisting of a base material, a polyolefin film layer, and a mesh-like reinforcing material, and FIG. 8 is a sectional view of a product obtained from the laminate. Explanation of symbols representing main parts of the figure 1...Base material, 2...Polyolefin film, 3, 15
... Laminate, 4... Support roll, 7.
... Needle, 12 ... Scratching hole, 14 ...
...Mesh-shaped reinforcement, 13.16...Final product.

Claims (1)

[Scope of Claims] 1. A polyolefin film layer is provided on the surface of a base material made of a material that has air permeability but blocks the passage of fine powder to form a laminate consisting of the base material and the polyolefin film, and the laminate is The body is passed between a support roll and a needle provided with its point facing toward the support roll so as to be in contact with the base material surface and the support roll, and then the pressure of the needle is applied so that only the polyolefin film is adjusting the polyolefin film layer so that it is perforated, and then running the laminate while supporting it with the roll, and scratching the polyolefin film layer with the needle to form a scratch hole penetrating the polyolefin film layer. A method for producing a breathable packaging material characterized by: 2. A polyolefin film layer and a mesh-like reinforcing material are sequentially laminated on the surface of a base material made of a material that has air permeability but blocks the passage of fine powder, thereby creating a laminate consisting of the base material, a polyolefin film, and a mesh-like reinforcement material. The laminate is passed between a support roll and a needle whose tip is directed toward the support roll, with the base surface facing the support roll, and then the pressure of the needle is applied. The needle is adjusted so as to perforate only the polyolefin film, and then the laminate is run while being supported by the support roll, and the needle scratches the polyolefin film layer, thereby penetrating the polyolefin film layer. A method for producing a breathable packaging material, the method comprising forming holes.